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2013
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mayer, georg
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English
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PubMed Central
by Mayer, Georg; Martin, Christine; Rudiger, Jan; Kauschke, Susann; Stevenson, Paul A; Poprawa, Izabela; Hohberg, Karin; Schill, Ralph O; Pfluger, Hans-Joachim; Schlegel, Martin
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This article is from BMC Evolutionary Biology , volume 13 . Abstract Background: Although molecular analyses have contributed to a better resolution of the animal tree of life, the phylogenetic position of tardigrades (water bears) is still controversial, as they have been united alternatively with nematodes, arthropods, onychophorans (velvet worms), or onychophorans plus arthropods. Depending on the hypothesis favoured, segmental ganglia in tardigrades and arthropods might either have evolved...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4015553